DO-AHEAD TIP: Marinate pork chops overnight or for at least 8 hours (see recipe).
In a small bowl, combine first 4 ingredients (mustard through Worcestershire).
Pour 2/3 cup of this mixture into a large zipper-topped plastic bag; add pork chops, seal bag and turn to coat. Refrigerate overnight or for at least 8 hours.
Cover and refrigerate remaining marinade for basting. Coat the rack of an indoor or outdoor grill with a little olive oil then preheat grill to MEDIUM.
Drain marinade from pork, discarding marinade and bag. Grill chops, covered, for 6 to 10 minutes per side or until a meat thermometer reads 160 degrees, basting occasionally with reserved marinade.
Discard any remaining marinade.